/**
 * MCP Tool Bridge
 * Provides a bridge between Markdown-based agent instructions and MCP tool calls
 * Maps external agent tool references to actual MCP tool implementations
 */

export interface ToolMapping {
  externalName: string;
  mcpToolName: string;
  parameterMapping?: Record<string, string>;
  defaultParameters?: Record<string, any>;
}

export interface ToolExecutionResult {
  success: boolean;
  data?: any;
  error?: string;
  toolUsed: string;
  parameters: Record<string, any>;
}

export class MCPToolBridge {
  private toolMappings: ToolMapping[] = [];

  constructor() {
    this.initializeToolMappings();
  }

  private initializeToolMappings(): void {
    // Standard tool mappings from external agent references to MCP tools
    this.toolMappings = [
      {
        externalName: 'Glob',
        mcpToolName: 'search-files',
        parameterMapping: {
          'pattern': 'pattern',
          'path': 'directory'
        }
      },
      {
        externalName: 'Grep',
        mcpToolName: 'search-content',
        parameterMapping: {
          'pattern': 'query',
          'files': 'files'
        }
      },
      {
        externalName: 'LS',
        mcpToolName: 'list-directory',
        defaultParameters: {
          'showHidden': false
        }
      },
      {
        externalName: 'Read',
        mcpToolName: 'read-file',
        parameterMapping: {
          'file': 'filePath'
        }
      },
      {
        externalName: 'Write',
        mcpToolName: 'write-file',
        parameterMapping: {
          'file': 'filePath',
          'content': 'content'
        }
      },
      {
        externalName: 'WebFetch',
        mcpToolName: 'fetch-url',
        parameterMapping: {
          'url': 'url'
        }
      },
      {
        externalName: 'TodoWrite',
        mcpToolName: 'manage-todos',
        parameterMapping: {
          'todos': 'todoList'
        }
      },
      {
        externalName: 'WebSearch',
        mcpToolName: 'web-search',
        parameterMapping: {
          'query': 'searchTerm'
        }
      },
      {
        externalName: 'Search',
        mcpToolName: 'search-content',
        parameterMapping: {
          'query': 'searchTerm',
          'scope': 'directory'
        }
      },
      {
        externalName: 'Task',
        mcpToolName: 'execute-task',
        parameterMapping: {
          'description': 'taskDescription',
          'subagent_type': 'agentType',
          'prompt': 'instructions'
        }
      },
      {
        externalName: 'Agent',
        mcpToolName: 'run-agent',
        parameterMapping: {
          'name': 'agentName',
          'context': 'context'
        }
      },
      {
        externalName: 'BashOutput',
        mcpToolName: 'get-bash-output',
        parameterMapping: {
          'shell_id': 'shellId'
        }
      },
      {
        externalName: 'KillBash',
        mcpToolName: 'kill-shell',
        parameterMapping: {
          'shell_id': 'shellId'
        }
      }
    ];
  }

  async executeTool(externalToolName: string, parameters: Record<string, any> = {}): Promise<ToolExecutionResult> {
    try {
      // Find mapping for the external tool
      const mapping = this.toolMappings.find(m =>
        m.externalName.toLowerCase() === externalToolName.toLowerCase()
      );

      if (!mapping) {
        // If no mapping found, try to execute as-is (for direct MCP tool calls)
        return await this.executeDirectTool(externalToolName, parameters);
      }

      // Transform parameters according to mapping
      const transformedParameters = this.transformParameters(parameters, mapping);

      // Execute the mapped MCP tool
      return await this.executeDirectTool(mapping.mcpToolName, transformedParameters);

    } catch (error: any) {
      return {
        success: false,
        error: `Tool execution failed: ${error.message}`,
        toolUsed: externalToolName,
        parameters
      };
    }
  }

  private transformParameters(parameters: Record<string, any>, mapping: ToolMapping): Record<string, any> {
    const transformed: Record<string, any> = {};

    // Apply default parameters first
    if (mapping.defaultParameters) {
      Object.assign(transformed, mapping.defaultParameters);
    }

    // Transform parameters according to mapping
    for (const [inputKey, inputValue] of Object.entries(parameters)) {
      if (mapping.parameterMapping && mapping.parameterMapping[inputKey]) {
        // Use mapped parameter name
        const outputKey = mapping.parameterMapping[inputKey];
        transformed[outputKey] = inputValue;
      } else {
        // Use original parameter name
        transformed[inputKey] = inputValue;
      }
    }

    return transformed;
  }

  private async executeDirectTool(toolName: string, parameters: Record<string, any>): Promise<ToolExecutionResult> {
    // This is a simulation - in a real implementation, this would call the actual MCP tools
    // For now, we'll simulate tool execution based on tool names

    try {
      let result: any;

      switch (toolName.toLowerCase()) {
        case 'search-files':
        case 'glob':
          result = await this.simulateFileSearch(parameters);
          break;

        case 'search-content':
        case 'grep':
          result = await this.simulateContentSearch(parameters);
          break;

        case 'read-file':
        case 'read':
          result = await this.simulateFileRead(parameters);
          break;

        case 'write-file':
        case 'write':
          result = await this.simulateFileWrite(parameters);
          break;

        case 'execute-task':
        case 'task':
          result = await this.simulateTaskExecution(parameters);
          break;

        case 'run-agent':
        case 'agent':
          result = await this.simulateAgentExecution(parameters);
          break;

        case 'list-directory':
        case 'ls':
          result = await this.simulateDirectoryList(parameters);
          break;

        default:
          result = { message: `Tool ${toolName} executed with parameters`, parameters };
      }

      return {
        success: true,
        data: result,
        toolUsed: toolName,
        parameters
      };

    } catch (error: any) {
      return {
        success: false,
        error: error.message,
        toolUsed: toolName,
        parameters
      };
    }
  }

  // Simulation methods - these would be replaced with actual MCP tool calls

  private async simulateFileSearch(parameters: Record<string, any>): Promise<any> {
    const { pattern, directory = '.' } = parameters;
    return {
      files: [`${directory}/example1.ts`, `${directory}/example2.ts`],
      pattern,
      matches: 2
    };
  }

  private async simulateContentSearch(parameters: Record<string, any>): Promise<any> {
    const { query, files } = parameters;
    return {
      query,
      matches: [
        { file: 'src/file1.ts', line: 42, content: `Found ${query} in context` }
      ]
    };
  }

  private async simulateFileRead(parameters: Record<string, any>): Promise<any> {
    const { filePath } = parameters;
    return {
      filePath,
      content: `// Contents of ${filePath}\n// File read successfully`,
      size: 256
    };
  }

  private async simulateFileWrite(parameters: Record<string, any>): Promise<any> {
    const { filePath, content } = parameters;
    return {
      filePath,
      bytesWritten: content?.length || 0,
      success: true
    };
  }

  private async simulateTaskExecution(parameters: Record<string, any>): Promise<any> {
    const { taskDescription, agentType, instructions } = parameters;
    return {
      taskDescription,
      agentType,
      status: 'completed',
      result: `Task executed: ${taskDescription}`,
      executionTime: Math.random() * 5000 // Simulate execution time
    };
  }

  private async simulateAgentExecution(parameters: Record<string, any>): Promise<any> {
    const { agentName, context } = parameters;
    return {
      agentName,
      status: 'completed',
      result: `Agent ${agentName} executed successfully`,
      context
    };
  }

  private async simulateDirectoryList(parameters: Record<string, any>): Promise<any> {
    const { directory = '.', showHidden = false } = parameters;
    return {
      directory,
      files: ['file1.ts', 'file2.ts', 'subdirectory/'],
      showHidden
    };
  }

  // Utility methods

  getAvailableTools(): string[] {
    return this.toolMappings.map(m => m.externalName);
  }

  getMappingForTool(externalToolName: string): ToolMapping | undefined {
    return this.toolMappings.find(m =>
      m.externalName.toLowerCase() === externalToolName.toLowerCase()
    );
  }

  addToolMapping(mapping: ToolMapping): void {
    // Remove existing mapping for the same external tool
    this.toolMappings = this.toolMappings.filter(m =>
      m.externalName.toLowerCase() !== mapping.externalName.toLowerCase()
    );

    // Add new mapping
    this.toolMappings.push(mapping);
  }

  removeToolMapping(externalToolName: string): boolean {
    const initialLength = this.toolMappings.length;
    this.toolMappings = this.toolMappings.filter(m =>
      m.externalName.toLowerCase() !== externalToolName.toLowerCase()
    );
    return this.toolMappings.length < initialLength;
  }

  getToolMappings(): ToolMapping[] {
    return [...this.toolMappings];
  }
}